Ling Han needed to prepare for two scenarios.
What if they couldn't find Pei Ji anymore?
This was an island, and there were only limited resources available. Only the Demonic Qi seemed to be limitless, appearing once every year. However, the other resources would definitely dwindle as they were used. There was simply no way that one could use the resources as they pleased.
Take, for example, the Godly metal that was used to strengthen puppets. Pei Ji had taken these from his master, and there was only a small amount remaining right now. If they took it away, Pei Ji would be missing a vital ingredient for puppet-making. No matter how talented he was, how could he make a puppet without the necessary materials?
Even if he carried some materials on him, he would only be able to make a limited amount of puppets. He would be dreaming if he wanted to recreate the large army of puppets that he'd once owned.